Reduction-furnace.



H. PAPE.

REDUCTION FURNACE.

APPLICATION FILED NOV. 28, 1913.

Patented June 22, 1915.

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Specification of Letters Patent.

Patented June 22, 1915.

Application filed November 28, 1913. Serial No. 803,606;

To aZZ whom it may concern:

Be it known that I, HERMANN Para, a citizen of the German Empire, and residing at Oker-in-the-Harz, Germany, have invented a certain new and useful Improved Reduction-Furnace, of which the following is a specification. I

In my co-pending patent application, Serial 1%. 725893, I have described a furnace in which a chamber, which is completely closed when the furnace is working, is arranged under the furnace proper. This chamber primarily serves as a blast-box from which the blast is introduced under pressure through openings at the bottom of the furnace into the reducing chamber. The molten products or residues can flow away through the same openings. According to the said patent application the blast-box is made suiliciently large and so arranged that a collecting device used for catching the molten mass, 6. g. a slag wagon or the like,

can be accommodated therein. According to the said patent application this collecting device may be arranged in such manner that it can be pushed under the said chamber or bl3Si1-l3OX which is made'suitahly low, or it may be suspended from the air-chamber or blast-box, a tight joint being made between the same in each case. The collecting device is emptied either intermittently or continuously; in the former case a slag wagon may be pushed out of the chamber when full and substituted by an empty wagon, and in the latter case the molten products may be run off out of the suspended or otherwise mounted collecting device into slag pots or the like placed in front thereof. In both these cases, i. e. when employing a slag wagon run into the said chamber, and when using the suspended collecting yessel for liquid slag and the like according to the said patent application, the working of the furnace can be impaired owing to the molten products is suing from the furnace congealing relatively rapidly at the surface of the molten material in the collecting device or vessel and forming stalagmite-lilce bodies between this collecting device and the openings of the furnace above the same.

A primary object of my invention is to obviate such disturbances in furnaces of the type described and, ilidesired, to bring about in one continuous operation the economically important separation of the valuable constituents of the molten material from the slag without having to smelt a second time.

Practical working with the furnace described in the said patent application has proved that this can be done without material change in the construction of the furnace provided that a hot flame is introduced into the blast-box between the openings in the bottom of the furnace and the collecting device or tank for the molten products or residues. Further, it has been found that this proviso can be fulfill ed with relatively simple means without disturbing the working of the furnace; the essence of the present invention resides therein. Accordingly, ahot flame is introduced into the blast-box in such manner that it impinges with sufficient energy on the surface, of the molten material in the collecting device, spreads over the same and constantly maintains its temperature so high that the formation of a congealed skin, or one undergoing the process of congealing, is-avoided. In addition, the space between the surface of the molten material and the'bottom of the furnace is, of course, also heated. The circumstance that the air requisite for working the furnace is diluted somewhat by the pro ucts ofcombustion of this hot flame does not materially hinder the working of the furnace because such dilution is always so small that the oxygen of the blast perfectly sufiices for the smelting, process, while the temperature of the blastis increased by the flame.

Some illustrative embodiments of the in- .vention' are represented by way of example in the accompanying drawing, wherein:

Figure l is a vertical section showing one furnace of the type described provided with means according to my invention, Fig. 2 is a like view of the bottom part of a furnace of modified construction provided with similar means, and Fig. 3 is a like view of the bottom of another modified furnace pro vided with similar means.

Referring first to Fig. 1 the furnace comprises the masonry body a which 18 charged with the charge through the hopper i. The bottom of the body of the furnace is provided with slot-like openings (Z through which the blast enters into-the charge, while the ga eous or vaporous products. c. metallic smoke and the like, are led from the charge through the flue The air-chamber or blast-box '1" is closed 0 all sides, and the blast. is forced into it by .way of the air pipe 9. In this chamber 1' is a slug wagon e which can be run out and in through the door 25 and is provided with two tap holes a and 8 formed as short pipes, the former being at the bottom and the latter near the top edge otthe wagon. These pipes pass through the door If and enable the molten products toflow out of the chamber I to 7 into pots, channels. or the like.

According to my invention I provide the nozzle for blowing" into the air-chamber or blastbox a mixture of gas and air, or an atomized liquid fuel and the requisite air for combustion, for forming an intensely surface of the contents of the wagon and spreads out thereon], l

The furnaces shown in Figs. 2 and 3 are arranged in substantially the same manner as that shown in Fig. 1, the principal difference being that the tank or collecting ves sel e is not inserted into the air chamber but is placed under the same,-=which is made correspondingly low, a tight'jointbeing provided between the same. n the form shown in Fig.2 the slag can'be run off in a manner similar to that in the form according to Fig. 1. In the form shown in Fig. 3 the tank or collecting vessel e is so shallow that all the molten productsof the furnace can be run off continuously through the tap hole 8 in order if'desired to be separated in devices which'are independent of the furnace.

furnace is the introduction into the air chamber or blast-box by means of one or more nozzles, burners or the like 0 of the hot flame which plays over the surface of the molten mass in the collecting device 6 and, as mentioned above, maintains it in a molten condition. The action of the hot flame can be observed through suitable peep holes in the air-chamber and regulated 210- 4 cordingly. The burner 0 may ofcourse be arranged movable. According to the invention it is immaterial whether the charge I) smelted in the furnace a contain considerable quantities of re which reference ismadein the said patent application, or not. It is to be understood that this invention is not limited to the working up of such materials. On the con- I claim -1, .1. In a furnace for continuously working 5 up a charge consisting of a mixture, of rehot flame which can be directed against the v up acharge consisting of a mixture of re The essence of the described forms ofhole in the lower portion thereof.

ducible compounds of volatile metals, to

both chambers for simultan p t ducing agents with substances containin reducible metallic compounds, at current 0' air passing through the charge from below upward, the combination with the reducing chamber having apertures in the 'bottom thereof, a blast-box located immediately below the reduction chamber, a pipe connected to the blast-box, and a collecting device for collecting molten material falling out of said apertures, Qfjndependent means for producing a hot flame playing on the surface of the molten material in the collecting device. I,

2. In a furnace for continuously working up a charge consisting of a mixture of reducing agents with substances containing reducible metallic compounds, a current of air passing through the charge from below upward, the combination with the reducing chamber having apertures in the bottom thereof, a blast-box located immediately below the reduction chamber, a pipe connected to the blast-box, and a collecting device for collecting molten material falling out of said. apertures, of independent burners in the blast-box for producinga hot flame playing on the surface of the molten material in the collecting device. 3. In a furnace for continuously working ducing agents with substances containing reducible metallic compounds, a'current of air passing through the charge from below upward, the combination with the reducing chamber having apertures in the bottom thereof, a blast-box located immediately below the reduction chamber, a pipe connected to the blast-box, and a collecting device for collecting molten material falling out of said apertures, of independent means for producing a hot flame playing on the surface of the molten material in the collecting device, said collecting device having a tarphole in the upper part thereof andaq thp- 1o 4. In a continuously working redul tion furnace, the combination with a melting chamber and a closed Wind chamberb low said chamber, of a grate 'separati g tlf chambers for simultaneously remdf -n g the moltenslags and supplying air (ffco ustion, an auxiliary flame below sald giate for keeping the molten residu d plts si through said grate into the 'yv iiidgh aihiber in molten condition, and meafi'i" hi tinuously collecting the m'olthf stantially as described. I 3: g

5. In a continuously u furnace, the combination chamber and a closed wind said melting chamber, of-Qagr the molten slags and supply I 9, I in; I bustion, an auxiliary fi2iriiebelow"sa id g?ate for keeping the molten residues passing through said grate into the Wind chamber In testimony whereof, I afiix my signa- 1n molten conchtmn, and :1 collectmn cham ture 1n the presence of two wltnesses.

ber 1th.n the x d ch uneet heated by SJld HERMANN PAPE anxlhary flame 101 colteutmg the molten I mass contmuously ch-lppmg trom smd me1t- -W1tnesses:

ing chamber (hrectl'y mto szud eollectlon Enxns'r H. L. B'IUMMENUQFF,

chamber, substantially as described. FRANCIS R. STEWART. 

